X220 hotkeys not working since System Update

I used System Update this morning and checked all possible updates, including the newest Intel driver for my X220. After that, most of the Fn keys and the on-screen infos stopped working. I uninstalled both the Intel driver and the Hotkey driver and installed them again, but the problem was still there. Now, I even deinstalled every non-driver Lenovo software and used System Update to install everything again, but the keys are still not working.

Do you know whether this is a general problem with the newest Intel driver? Or does this have to do with some other update?